Abstract
In the winter of 1994/95 the German Transall research aircraft performed 5 campaigns in the European Arctic with 22 flights altogether. An extensive dataset of HNO3, ClONO2 and O3 column amounts was obtained by MIPAS-FT (Michelson Interferometer for Passive Atmospheric Sounding - Flugzeug Transall) onboard the aircraft. In this paper we present the variability of the ClONO2 reservoir gas in the course of the winter. We include groundbased FTIR measurements of HF, HCl and ClONO2 to discuss the airborne observations with regard to the partitioning of inorganic chlorine.
From mid-December until the end of January, MIPAS measured a stable ClONO2 collar with constantly low column amounts inside the polar vortex and maxima at the edge. This observation reflected widespread conversion of ClONO2 to reactive chlorine inside the vortex for at least six weeks. In good accordance, the ground stations measured low in-vortex HCl and ClONO2 column amounts and conversion of HCl into ClONO2 in the region of the ClONO2 maxima. In the first week of February the ClONO2 amounts started to increase in the edge region as well as inside the vortex. Between March 21 and 27, just one week after the last cold period, MIPAS observed exclusively high ClONO2 column amounts inside the vortex, indicating fast deactivation of active chlorine. In the same period the ground stations measured an excess of ClONO2 over HCl. Further, the high ClONO2 implies that the polar vortex was renoxified in March. Lower ClONO2 values, observed inside the vortex on the flights of April 5 and 8, and an increased HCl/ClONO2 ratio, measured from ground, marked the starting redistribution within the chlorine reservoir species to the photochemically more stable HCl.
In February, March and April, MIPAS observed mixing of ClONO2-rich air masses with midlatitude air at the vortex edge. A very clear event happened on March 27. On this flight a distinct ClONO2 minimum was measured at the vortex edge, which was closely correlated with a filament of midlatitude air observed by OLEX (Ozone Lidar EXperiment) onboard the Transall.
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References
Bell, W., Paton-Walsh, C., Gardiner, T.D., Woods, P.T., Swann, N.R., Martin, N.A., and Donohue, L., 1996, Measurements of stratospheric chlorine monoxide (ClO) from groundbased FTIR observations, J. Atmos. Chem., 24, 285–297.
Bell, W., Paton-Walsh, C., Gardiner, T.D., Woods, P.T., Donohoe, L., Gould, A., Secker, D., Naughton, S., Swann, N.R., Martin, N.A., Page, L.E., Chipperfield, M.P., Lee, A.M., and Pullen, S., 1997, Groundbased FTIR measurements of stratospheric trace species from Aberdeen during winter 1993/1994 and 1994/1995 and comparison with a 3D model, this issue.
Blom, C.E., Fischer, H., Glatthor, N., Gulde, T., Höpfner, M., and Piesch, C., 1995, Spatial and temporal variability of ClONO2, HNO3, and O3 in the Arctic winter of 1992/1993 as obtained by airborne infrared emission spectroscopy, J. Geophys. Res., 100, 9101–9114.
Blumenstock T., Fischer, H., Friedle, A., Hase, F., Schreiber, J., and Thomas, P., 1996, Column amount of trace gases measured by groundbased FTIR spectroscopy near Kiruna, Sweden, during winter 1994/1995, Polar stratospheric ozone, Proceedings of the third European workshop, 18 to 22 September 1995, Schliersee, Bavaria, Germany, 340–343.
Chipperfield, M.P. et al., 1997, Comparison of SESAME data with a 3D chemical transport model, this issue.
Echle, G., Oclhaf, H., and Wegner, A., 1992, Measurement of atmospheric parameters with MIPAS, final report, ESA contract, 9597/91/NL/SF, Eur. Space Agency, Noordwijk, The Netherlands.
Galle, B., Mellqvist, J., Arlander, D.W., Chipperfield, M.P., and Lee, A.M., 1997, Groundbased FTIR measurements of stratospheric trace species from Harestua, Norway, during Sesame and comparison with a 3-D model, this issue.
Gulde, T., Piesch, C., Blom, C.E., Fischer, H., Fergg, F., and Wildgruber, G., 1994, The airborne MIPAS emission experiment, Proc. of the 1st Internal. Airborne Remote Sensing Conference and Exhibition, ERIM, Ann Arbor, MI, Vol. II, 301–311.
Höpfner, M., Blom, C.E., Fischer, H., Glatthor, N., Gulde, T., Piesch, C., Renger, W., and Wirth, M., 1997, HNO3 and PSC measurements from the TRANSALL: sequestering of HNO3 in the winter of 1994/95, this issue.
Naujokat, B., Labitzke, K., Lenschov, R., Rajewski, B., Wiesner, M., and Wohlfahrt, R.-C., 1995, The stratospheric winter 1994/95: a cold winter with a strong minor warming, Beilage zur Berliner Wetterkarte, SO 24/95.
Schmidt, U., Bauer, R., Engel, A., Borchers, R., and Lee, J., 1994, The variation of available chlorine, Cly, in the Arctic polar vortex during EASOE, Geophys. Res. Lett., 13, 1215–1218.
Toumi, R., Jones, R.L., and Pyle, J.A., 1993, Stratospheric ozone depletion by ClONO2 photolysis, Nature, 365, 37–39.
von Clarmann, T., Fischer, H., Friedl-Vallon, F., Linden, A., Oelhaf, H., Piesch, C., and Seefeldner, M., 1993, Retrieval of stratospheric O3, HNO3, and ClONO2 profiles from 1992 MIPAS-B limb emission spectra: method, results and error analysis, J. Geophys. Res., 98, 20,495–20,506.
von Clarmann, T., 1994, RAT: A computational tool for retrieval of atmospheric trace gas profiles from infrared spectra, KfK Report No. 5423, Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany.
Wirth, M., Ehret, G., Mörl, P., and Renger, W., 1994, Two dimensional stratospheric aerosol distributions during EASOE, Geophys. Res. Lett., 21, 1287–1290.
Wirth, M., and Renger, W., 1996, Evidence of large scale ozone depletion within the arctic polar vortex 94/95 based on airborne LIDAR measurements, Geophys. Res. Lett., 23, 813–816.
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Glatthor, N., Blom, C., Blumenstock, T. et al. MIPAS-Transall Observations of the Variability of CLONO2 during the Arctic Winter of 1994/95. Journal of Atmospheric Chemistry 30, 81–101 (1998). https://doi.org/10.1023/A:1006038723863
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DOI: https://doi.org/10.1023/A:1006038723863